The Muscles

S
ome 600 muscles of all sizes and shapes are attached to the framework of
the skeletal system. Altogether these muscles make up nearly half of a
normal adult's weight. They hold the skeleton together and, on
signals originating in the brain, empower its various parts to move.
Everywhere throughout the skeletal system, muscles work together with
bones to protect the body's vital organs and to support and move
its parts.